The majority of structures have solid gray limestone quoins; however, exceptions are red sandstone, brown sandstone, or blue stone (Lockport sandstone). The shape, position and finish of the stone quoins varies. Shape is defined as height, width and depth measures of the stone block. The term "variable" states that the individual quoins used do not have one or more dimensions the same, whether in the same corner or compared to other corners. Position is defined as each quoin position at the corner of the structure in relation to adjacent quoins and rows of cobblestones. The term tooled refers to a finish on the stone face, if not smooth or rough cut, where the marks made by the masons' tools are visible, typically in straight lines across the stone face. Chamfered refers to the symmetrical rounding of edges.
When bricks are used, they may be defined as type, color, and number laid in length and height, arranged as a group which, in some instances, the masons have laid bricks in a stone quoin-like format.
Roudabush Survey, Corner Structures, page 16
Lim_2_3.jpg Stone blocks. | Sod_2_4.jpg Variable, rough cut gray limestone quoins | Sod_14_3.jpg Square cut gray limestone, tooled quoins | Wal_10_2.jpg Brick corner structure in quoin pattern. Note quoin-like brick window sides and brick lintels. |